Improvement in bolting flour



J. WRIGHT.

Mm Bolt.

No. 41.737. Patented Feb. 23,1864.

NV PETERS, Phalo-Lilhngrapher. Wnshngion. D..C.

UNITED STATES` PATENT OFFICE.

J. WRIGHT, OF ST. LOUIS, MISSOURI.

IMPRQVEMENT |N- Bom-ING FLoua, ao.

' Specification forming part ofLctiers Patent No. 4 M737, dated February 23, 1864.

Flour, Dustin g Bran, and Like Purposes 5 and;`

I do hereby declare that the following is a full,

clear, and exact description of the same, ref- J erence being had to the accompanying drawings, making a part of thisspecification, in which-- Figure l is a side sectional view of my in-v vention taken in the line aa', Fig. 2; Fig. 2, a horizontal section of the same taken in the line y y, Fig. 1; Fig. 3, a detached perspective view of the means employed for giving a shake motion to the bolt. y

Similar letters of reference indicate correspondin g parts in the several figures.

This invention consists in having one or more spiral screens and a spiral chute attached toavertical rotating shaft and inclosed by a suitable case, whereby the flour, bran, or other substance to be bolted or screened will be allowed to pass down and over the screen and chute as the latter revolve, and be bolted or screened in the most thorough manner.

The invention also consists in using, in connection with the spiral screen and chute aforesaid a hopper, which is also attached to the screen-shaft, has an opening in its bottom, and is arranged to operate with a scraper in such a manner that the flour or other substance to be bolted or screened will be fed properly to the screens.

To enable those skilled in the art to fully understand and construct my invention, I will proceed to describe it.

A represents'a vertical shaft, the upper end of which has its bearing in a cross-piece, c, at the upper ends of two uprights, b b, which are attached to a suitable base, B. The lower end ofthe shaft A is stepped in a block, C, which is attached to the base B. The hole c in the block O is of oblong form, as shown in Fig. 3 and in dotted lines in Fig. 2, so as to admit of a lateral movement of the lower journal, d, of the shaft A, which journal works in said hole, and the upper surface of the block G is provided with two vertical projections, c e, one at each end of the hole c, as shown clearly in Fig. 3. The upper surface of the block C, at each side of the hole c, is made of inclined form, as

`shown at ff', one inclined surface being in a reverse position to the other. The shaft `A is of polygonal form, and it has a series of arms,

g, attachedto it in two spiral lines, and upon these arms the screen Dl and chute D are secured. -The screen may be constructed of wire-cloth, or bolting-cloth may be used, ac-` cording to the work designed to be done. For bolting indian-meal a wire-screen may be used,

but bolting-.cloth would be preferable for bolting flour and dusting bran. The chute-.D may be constructed of canvas or thin boards. The screen D' is directly over the chute D, and they both are inclosed within a ease,E, which may extend from the top to the bottom of the shaft A, so as to completely enclose them 5` or it v circular hopper, F, which has a slot or opening, 7L, made radially in its bottom and extending from the shaft A to the outer edge of the bottom. The hopper E is equal in diameter to the case E, and the upper edge of the former is directly underneath the cross-piece a. of the up-v rights b b. To the cross-piece a there is at-v tached at one side a scraper, G, which extends down within the hopper and has its lower edge nearly in contact with the bottom of the hopper, as shown in Fig. 1. To the base B there is attached a circular box, H, which is divided by a partition, i, so as to form two annular con centric troughs, I I', each of which has a dischargeopening,j, in its bottom, as indicated by the dotted lines in Fig. 2, and to the lower end of the screen D' there is attached a spout, J', which conveys the bran into the trough I', the other spout, J, being attached to the chute D, and conveying the lour into the trough I.

The operation is as follows The flour or other substance to be bolted is placed in the hopper F, and a rotary motion is given the shaft Aby any convenient power., The flour or other substance in the hopper G is, as said hopper rotates, discharged through the open ing h by means of the scraper Gr. The flour falls upon the screen D and passes through it down upon the chute D, the bran being retained on the screen D and discharged therefrom through spout J into the trough I', while the our is discharged from the chute D through the spout J into the trough I. As the shaft A rotates it has an up-and-down and a lateral shake motion colnmunicatedto itin consequence of a projection, k, on the lower iournal, d, ofthe shaft acting upon the inclined surfaces ff of the block C, and against the vertical projections e c thereon. This projection la raises the shaft in passing over the inclined surfaces f f', and as said projection reaches the upper part of each inclined surface it comes in contact with a vertical projection, e, and throws the journal d back in the hole c, which gives a lateral movement to the shaftA, and as soon as the projection k clears the projecticn c, with which it came in contact, it drops upon thelower end of the inclined surface f or j" infront of it and again raises the shaft and the parts attached to it until it vcomes in contact with the other projection, e, when the lateral movementis again given the shaft until the projection k clears the projection e and the former falls upon the inclined surface in front of it. Thus an up-and-down and lateral shake motion is given the screen and chute, and the former prevented from becoming choked or clogged.

The device occupies but little space, and may be constructed at a very reasonable cost. The screen and chute have an inclined position given them, being elevated at their outer ends in order to counteract centrifugal force and prevent the our and grain being thrown in contact with the case E.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The spiral screen D', one or more, attached to a vertical rotating shaft, A, in connection with a spiral chute, D, also attached to the `shaft A, the screen and chute being encompassed by a case, E, and all arranged to operate as and for the purpose herein set forth.

2. The hopper F, attached to the shaft A above the screen D, in combination with the stationary scraper Gr and the opening hin the bottom of the hopper, for the purpose herein set forth.

3. The annular troughs I I on the base B, and underneath the screen D and chute D, when used in connection with the screen and chute arranged on the shaft A and the spouts J J', for the purpose specified.

J. WRIGHT.

Witnesses Jas. A. J oNEs, J Aeon S. MERRELL. 

